/* =========================================
   全局变量 & 主题
   ========================================= */
:root {
  --color-primary: #6c63ff;
  --color-primary-dark: #5a52d5;
  --color-primary-light: #8b85ff;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fc;
  --color-surface: #ffffff;
  --color-text: #2d3436;
  --color-text-light: #636e72;
  --color-text-muted: #b2bec3;
  --color-border: #e9ecef;
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-card-hover: #f0f0ff;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --transition: 0.3s ease;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --max-width: 1100px;
  --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="dark"] {
  --color-primary: #8b85ff;
  --color-primary-dark: #6c63ff;
  --color-primary-light: #a5a0ff;
  --color-bg: #1a1b2e;
  --color-bg-alt: #222340;
  --color-surface: #2a2b48;
  --color-text: #e8e8f0;
  --color-text-light: #b0b0c8;
  --color-text-muted: #6e6e8a;
  --color-border: #3a3b58;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-card-hover: #32335a;
  --nav-bg: rgba(26, 27, 46, 0.88);
}

/* =========================================
   基础重置
   ========================================= */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

ul { list-style: none; }

img {
  max-width: 100%;
  display: block;
}

/* =========================================
   容器
   ========================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================
   导航栏
   ========================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.nav-menu ul {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition);
}

.icon-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-card-hover);
}

.menu-toggle {
  display: none;
}

/* =========================================
   英雄区
   ========================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 24px 60px;
  position: relative;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
  max-width: 680px;
}

.hero-avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 24px;
  border: 4px solid var(--color-primary);
  box-shadow: 0 0 40px rgba(108, 99, 255, 0.25);
  animation: fadeInUp 0.8s ease;
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 12px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.highlight {
  color: var(--color-primary);
  position: relative;
}

.highlight::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--color-primary);
  opacity: 0.2;
  border-radius: 4px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--color-text-light);
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-social {
  display: flex;
  gap: 20px;
  justify-content: center;
  font-size: 1.3rem;
  animation: fadeInUp 0.8s ease 0.5s both;
}

.hero-social a {
  color: var(--color-text-light);
  transition: all var(--transition);
}

.hero-social a:hover {
  color: var(--color-primary);
  transform: translateY(-3px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}

.hero-scroll-indicator i {
  font-size: 0.9rem;
}

/* =========================================
   通用板块
   ========================================= */
.section {
  padding: 96px 0;
  transition: background var(--transition);
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 56px;
  font-size: 1.05rem;
}

/* =========================================
   按钮
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* =========================================
   关于我
   ========================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 56px;
  align-items: center;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px var(--color-shadow);
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.about-image:hover img {
  transform: scale(1.05);
}

.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.about-text p {
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.about-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 24px 0;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.info-label i {
  margin-right: 4px;
  color: var(--color-primary);
}

/* =========================================
   技能
   ========================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.skill-category {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--color-shadow);
}

.skill-category h3 {
  font-size: 1.1rem;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.skill-category h3 i {
  margin-right: 8px;
}

.skill-bar {
  margin-bottom: 18px;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--color-text-light);
}

.skill-track {
  height: 8px;
  background: var(--color-bg-alt);
  border-radius: 4px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  border-radius: 4px;
  transition: width 1.2s ease;
}

/* =========================================
   项目作品
   ========================================= */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px var(--color-shadow);
}

.project-image {
  position: relative;
  overflow: hidden;
  height: 200px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-image img {
  transform: scale(1.1);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-overlay .btn-outline {
  border-color: #fff;
  color: #fff;
}

.project-overlay .btn-outline:hover {
  background: #fff;
  color: #333;
}

.project-info {
  padding: 20px;
}

.project-info h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.project-info p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tags span {
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* =========================================
   经历时间线
   ========================================= */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 32px;
}

.timeline-dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline-content {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 16px var(--color-shadow);
  transition: all var(--transition);
}

.timeline-content:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 32px var(--color-shadow);
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.timeline-content h4 {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* =========================================
   联系
   ========================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-top: 4px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card-hover);
  border-radius: 50%;
}

.contact-item h4 {
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.contact-social {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

.contact-social a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-card-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  font-size: 1.2rem;
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.contact-social a:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-3px);
}

.contact-form {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 20px var(--color-shadow);
}

.form-group {
  margin-bottom: 16px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* =========================================
   页脚
   ========================================= */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer p + p {
  margin-top: 4px;
}

/* =========================================
   回到顶部按钮
   ========================================= */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(108, 99, 255, 0.3);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* =========================================
   动画
   ========================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

/* 滚动动画 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   响应式设计
   ========================================= */
@media (max-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
    transform: translateY(-120%);
    opacity: 0;
    transition: all var(--transition);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-menu ul {
    flex-direction: column;
    gap: 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-image img {
    height: 280px;
  }

  .about-info {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .timeline {
    padding-left: 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .container {
    padding: 0 16px;
  }
}